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Revision as of 11:10, 16 July 2018

Forced induction comes in two forms: Supercharging and Turbo-supercharging. This article will focus on the turbocharger. For a comparison with the supercharger, see Forced Induction.

For the turbo compressor itself, see Turbos

Overview

For specific turbocharger models, see Turbos

Big Power from a stock A-series engines can be had by adding a turbocharger. A turbo setup on an A12 makes more power and torque than a worked non-turbo A14, for a fraction of the build cost.

See Main Article: $1200 EFI Turbo A12

Turbo setups range from modest to wild.

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Discussion: ^POST regarding Turbocharging A12

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Stage 1

20% more HP than stock.

A stock A-series engine can take 10 psi. You don't even need an intercoolor, and so you can use draw-through on a stock carburetor. But blow-through is easier.

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Stock engine
Loop piping from stock exhaust manifold (J-pipe)
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Small Wrecking yard turbo ($100). If sized small enough, no wastgate or blow-off valve is needed
Tee into the oil pressure line, feed it into turbo. Tap a return line into the oil pan
Piping from turbo to stock carburetor via a top hat
Set initial timing at 3 degrees
In the distributor, weld the advance slots partially to limit mechanical advance
Keep the stock vacuum advance (it will have no effect under boost)
Fit larger power valve to carburetor
Fit secondary main jet two sizes larger
Stock fuel piping with medium pressure fuel pump (above 10 psi)

Limit boost to 5 psi.

Or go to 10 psi for short bursts on cooler days.

Stage 2

10 psi. 40% more HP.

stock block and head
Fit Intercooler (precludes use of draw-through)
Box the carburetor to go higher than 10 psi
Rejet primary main two sizes larger. Secondary main 3 sizes larger. Power valve increase.
Retard timing to 0 degrees. Connect vacuum advance up directly to manifold. This will help idle and starting out under low throttle, but the vacuum advance will have no effect under boost
Use 75.5-degree thermostat
High volume/high pressure fuel pump
anti-surge tank up front
Use custom exhaust manifold to mount the turbo
2" exhaust
H165 rear axle

Stage 3

100% more HP than stock. Requires modified engine, but not high-RPM usage.

2 bar (28.2 psi)

1 bar (14.7 psi)

Do all the stage 2 modifications plus:

Use new Nissan rod bolts, torque to spec
Use ARP head studs
Fit Intercooler (precludes use of draw-through)
Custom pistons for low compression (7:1)
A12GX head, ported
Copper head gasket
Oil Cooler
EFI (or professionally modified & tuned box carburetor)
custom inlet manifold with large runners
2.5" exhaust
Carefully-sized ball bearing turbo
5/16" fuel lines and high volume/high pressure fuel pump
Fuel tank modified with baffles, or anti-surge tank up front
Custom-recurved distributor with Electronic Ignition
Spark retard system
Water-injection system
63-Series Transmission for A-series
Heavy duty clutch
H190 rear axle (or H165 rear axle with heavy-spline axles)
traction bars

Proof

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A15ETT

See main article: A15ETT

Twin-turbo A15 by 1200rallycar
A15 Before: 52.3 kw (70.1 hp)
A15 After: 75.6 kw (101.4 hp)

Sikyne's A12

See: ^POST A12 Turbo Development thread

160+ rwhp @ 15 lbs boost (standard H89 Head)
240+ rwhp @ 24 lbs boost (big valve ported head)
2nd-hand GT2860R (707160-5) ball bearing turbo
E85 fuel, intercooled
stock and unmodified H89 head
Cam: 236 Degrees at .050 lift
Maximum advance at 16 psi boost: 23 degrees
ARP head studs
stock pistons, crank and rods
standard headgasket
about 120 Lb Ft from 5100 to 6800 RPM @ 15 psi

dyno chart
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Turbo systems

Oh boy, there are a lot of choices when turbo-ing your engine.

See Main Article: Turbo systems

Builds

B20 A15

A15 with Toyota CT12 turbo
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datsmokin

^POST HELP !! A12 turbo

datsonovic

Zenith-Stromberg 1.75 with T04 turbo

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Empson

A series suck through turbo setup by James Empson (twitch@bigpond.com) 2008/05/01 Datsun B10 coupe

The turbo is an IHI - RB6, originally off a mitsubishi Galant 2 litre. the exhuast manifold is off an A15, with a flange welded onto it. The inlet manifold is suited to an Oval port head, the SU is a 1.5 inch.

fat910

See a12 turbo 1200 sedan

Unmodified A12 short block
8 to 10 pound boost
hi flow garrett t2
custom hat and weber carb
custom sump
vl turbo fuel pump with malpassi fuel reg
saab turbo bov

It is easier to build up a 120Y engine instead of a 1200 engine as the alternator is not on the exhaust side

blow through A12
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Top-hatted carburetor on A12
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frankthedolphintrainer

Weber 32/36 blow-thru with frankthedolphintrainer turbo manifold
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Intercooler
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josh_c

Suck-through SU, the classic setup

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kegs

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Turbocharged A15
Twin Dellorto DHLA 45 carburetors on Redline manifold
Custom airbox hat
Garret A/R 48 turbo
Intercooler from 200SX
2.5 inch dump pipe
Liverpool Exhaust

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more photos

oan78

A12 Sedan with Weber and Hitachi turbo
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A12 wagon with 175 Stromberg and Mazda 20B turbo
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rice

For maximum boost, use a large turbo. Lag is heavy, but still operable.

* Drawthrough
* 45 Weber DCOE carburetor
* T4 turbo @ 10 psi
* Compression ratio: 8.2:1

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topgear

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A12 turbo made 100kw rwhp on 12-13 lbs boost

See Main Article: Topgear A12 Turbo

stock block except for new rings
A14 head
suck-through SU carburetor
no intercooler

slam1024

slam1024 added a turbo

* 1973 Datsun 1200 2-door sedan
* Custom manifold with runners from Tercel
* stock SU blow-through setup from 1.3 liter MG Metro Turbo

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steveo 1

Using stock exhaust manifold with suck-through. Cut oval port manifold with hose to connect it to the pipe work that goes to the commpressor side of the turbo and the turbo sits on the sunny manifold. it look better in real life!

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Photos

See
Turbo Manifold Photos
Turbo Photos 1 
Turbo Photos 2
Intercooler Photo Index

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Turbo